S
M
T
W
T
F
S
30
92°
81°
31
87°
82°
1
87°
83°
2
88°
82°
3
87°
82°
4
87°
81°
5
88°
82°
6
87°
82°
7
87°
81°
8
88°
81°
9
87°
80°
10
87°
81°
11
88°
82°
12
88°
81°
13
87°
82°
14
87°
82°
15
88°
81°
16
87°
82°
17
87°
82°
18
88°
81°
19
87°
82°
20
87°
82°
21
88°
81°
22
87°
82°
23
87°
82°
24
88°
81°
25
87°
82°
26
87°
81°
27
88°
82°
28
89°
79°
29
90°
80°
30
90°
80°
1
89°
79°
2
89°
80°
3
90°
80°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St Thomas
St Thomas's September 2026 forecast shows daily high temperatures ranging from 87° to 92°, with overnight lows between 79° and 83°. The average high for September is 88° with an average low of 81°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in St Thomas. See also: October | November | December.
